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Browsing Геология России by Author "Iezzi G."

Now showing items 1-7 of 7

BNA-BLI SOLID-SOLUTION IN A-SITE-VACANT AMPHIBOLES: SYNTHESIS AND CATION ORDERING ALONG THE FERRI-CLINOFERROHOLMQUISTITE-RIEBECKITE JOIN

Iezzi G.; Ventura G.D.; Camara F.; Pedrazzi G.; Robert J.L. (2003)

Amphiboles were hydrothermally synthesized at 500 8C and 4 kbar in the system Li2O-Na2O-FeO- Fe2O3-SiO2-H2O, with nominal compositions along the riebeckite [¦ Na2Fe3 2+ Fe2 3+ Si8O22(OH)2]-ferri-clinoferroholmquistite [¦ ...
CRYSTAL FABRIC EVOLUTION IN LAVA FLOWS: RESULTS FROM NUMERICAL SIMULATIONS

Iezzi G.; Ventura G. (2002)

The analysis of the preferred orientation of crystals (crystal fabric) in magmatic rocks has become a widely used technique for the reconstruction of the flow history. However, little is known about the evolution of the ...
HT-XRD STUDY OF SYNTHETIC FERRIAN MAGNESIAN SPODUMENE: THE EFFECT OF SITE DIMENSION ON THE P21/C→C2/C PHASE TRANSITION

Camara F.; Iezzi G.; Oberti R. (2003)

Ferrian magnesian spodumene was synthesized in the MLFSH system at P=0.4 GPa, T=700 °C, fO2=NNO+2.3. The space group at room T is P21/c [a=9.638(3) A, b=8.709(2) A, c=5.258(2) A, β=109.83(3)°, V=415.2 A3]. The structure ...
SYNTHESIS AND CRYSTAL-CHEMISTRY OF ALKALI AMPHIBOLES IN THE SYSTEM NA2O-MGO-FEO-FE2O3- SIO2-H2O AS A FUNCTION OF FO2

Della Ventura G.; Iezzi G.; Novembre D.; Redhammer G.J.; Hawthorne F.C.; Scaillet B. (2005)

This paper reports the results of hydrothermal synthesis in the system Na2O-MgO-FeO-Fe2O3-SiO2-H2O. Four samples of stoichiometric magnesioriebeckite composition, ideally □Na2Mg3Fe3+2 Si8O22(OH)2, were run at 700–800 °C, ...
SYNTHESIS, CRYSTAL STRUCTURE AND CRYSTAL CHEMISTRY OF FERRI-CLINOHOLMQUISTITE, □LI2MG3 FE3+2SI8O22(OH)2

Iezzi G.; Cámara F.; Oberti R.; Della Ventura G.; Pedrazzi G.; Robert J.-L. (2004)

This work reports the synthesis of ferri-clinoholmquistite, nominally □Li2(Mg3Fe3+2)Si8O22(OH)2, at varying f O 2 conditions. Amphibole compositions were characterized by X-ray (powder and single-crystal) diffraction, ...
THE (MG,FE2+) SUBSTITUTION IN FERRI-CLINOHOLMQUISTITE, □LI2(MG,FE2+)3FE3+2SI8O22(OH)2

Iezzi G.; Novembre D.; Della Ventura G.; Hawthorne F.C.; Pedrazzi G.; Roberrt J.-L. (2005)

Amphiboles have been synthesized by hydrothermal techniques at 500–600 °C, 1 Kbar P(H2O) and low oxygen fugacity (close to NNO) at nominal compositions along the join ferri-clinoholmquistite [squareLi2Mg3Fe3+2Si8O22(OH)2] ...
THE P21/M ↔ C2/M PHASE TRANSITION IN SYNTHETIC AMPHIBOLE NA NAMG MG5 SI8 O22 (OH)2: THERMODYNAMIC AND CRYSTAL-CHEMICAL EVALUATION

Cámara F.; Oberti R.; Iezzi G.; Della Ventura G. (2003)

The P21/mC2/m displacive phase transition in the synthetic end-member amphibole Na NaMg Mg5 Si8 O22 (OH)2 has been studied by monitoring changes in unit-cell parameters and the intensities of superlattice reflections at ...

Browsing Геология России by Author "Iezzi G."

Browsing Геология России by Author "Iezzi G."

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